<form action="<?php e_action("replySubmit"); ?>" method="post"  enctype="multipart/form-data">
    <input type="hidden" name="id" value="<?php echo $r['id']?>">
    <fieldset>
        <legend>回复信息</legend>
        <textarea name="reply" id="reply" placeholder="请输入回复信息" required></textarea>
        <input type="submit" value="回复">
    </fieldset>
</form>